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The generator of AM EMFs consists of a battery-driven radiofrequency (RF) EMF generator connected to a 1.5 m long 50 ? coaxial cable, to the other end of which a stainless-steel spoon-shaped mouthpiece is connected via an impedance transformer. The RF source of the device corresponds to a class C amplifier operating at 27.12 MHz. The carrier frequency is AM with a modulation depth of 85±5%, whereas the modulation frequency is generated by a digital direct synthesiser with a resolution of 10-7. The treatment sequence is controlled by a microcontroller (Atmel AT89S8252, Fribourg, Switzerland), that is, duration of session, sequence of modulation frequencies and duration of each sequence can be programmed via PC over a RS232 interface. The RF output is adjusted to 100 mW into a 50 ? load, which results in an emitting power identical to that of the device used for the treatment of insomnia.
Software Defined Radio (SDR) is an advanced radio technology in which flexibility is achieved in using radio functions such as modulation and demodulation of radio signals are carr
UniJunction Transistor: (abbreviated as UJT), also called the double base diode, is a 2 layer, 3 terminal solid state switching device. The device has a unique characteristi
Q. The truth table for F(A,B,C) = mi (2, 3, 4 5) is as follows: (a) Express F in a canonical sum-of-products form. (b) Minimize F in an SOP form, and obtain a possible realiz
Consumer Interaction and Service Standards These KPIs deal along with the customer, internal business procedures and change management. These are significant to give the desir
Q. What is the basic principle of oscillation in an RC phase shift oscillator. With a neat sketch explain its working? For producing oscillations there must have positive feedb
What are the advantages of distributing windings in an alternator?
(a) Consider the following transmission line with the reactance X1 placed across the input. It is being driven with a frequency ω such that the length of the line is λ/4. W
Q. Consider a series-carry synchronous counter with T flip-flops shown in Figure in which the AND gates carry forward the transitions of the flip-flops, thereby improving the speed
Q. At the two terminals (A, B) of a one-port network, the voltage and the current are given to be v(t) =200 √2 cos (377t + 60°) V and i(t) = 10√2 cos(377t + 30°) A. (a) Determin
how do I find the ic and ve
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